单项选择题

Atacertaincustomer’ssite，aNASislogicallyinthetrafficpat……

At a certain customer’s site， a NAS is logically in the traffic path but not physically in the trafficpath. The NAS identifies clients by their IP addresses. In which access mode has this NAS beenconfigured to operate？（）

A. Layer 2 Edge mode
B. Layer 2 Central mode
C. Layer 2 In-Band mode
D. Layer 3 mode

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